8158491 has 24 divisors (see below), whose sum is σ = 13418496. Its totient is φ = 4728240.

The previous prime is 8158489. The next prime is 8158499. The reversal of 8158491 is 1948518.

It is not a de Polignac number, because 8158491 - 2¹ = 8158489 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8158499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 486 + ... + 4068.

It is an arithmetic number, because the mean of its divisors is an integer number (559104).

Almost surely, 2^8158491 is an apocalyptic number.

8158491 is a deficient number, since it is larger than the sum of its proper divisors (5260005).

8158491 is a wasteful number, since it uses less digits than its factorization.

8158491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623 (or 3620 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 8158491 is about 2856.3072313741. The cubic root of 8158491 is about 201.3121310680.

It can be divided in two parts, 8158 and 491, that added together give a square (8649 = 93²).

The spelling of 8158491 in words is "eight million, one hundred fifty-eight thousand, four hundred ninety-one".